Tag: 300-400

《Hydrogen-Bonded Crystalline Molecular Machines with Ultrafast Rotation and Displacive Phase Transitions》 was written by Colin-Molina, Abraham; Jellen, Marcus J.; Rodriguez-Hernandez, Joelis; Cifuentes-Quintal, Miguel Eduardo; Barroso, Jorge; Toscano, Ruben A.; Merino, Gabriel; Rodriguez-Molina, Braulio. Formula: C12H7Br2N And the article was included in Chemistry – A European Journal in 2020. The article conveys some information:

Two new crystalline rotors 1 and 2 assembled through N-H···N hydrogen bonds by using halogenated carbazole as stators and 1,4-diaza[2.2.2]bicyclooctane (DABCO) as the rotator, are described. The dynamic characterization through 1H T1 relaxometry experiments indicate very low rotational activation barriers (Ea) of 0.67 kcal mol-1 for 1 and 0.26 kcal mol-1 for 2, indicating that DABCO can reach a THz frequency at room temperature in the latter. These Ea values are supported by solid-state d. functional theory computations. Interestingly, both supramol. rotors show a phase transition between 298 and 250 K, revealed by differential scanning calorimetry and single-crystal X-ray diffraction. The subtle changes in the crystalline environment of these rotors that can alter the motion of an almost barrierless DABCO are discussed here. In the part of experimental materials, we found many familiar compounds, such as 3,6-Dibromo-9H-carbazole(cas: 6825-20-3Formula: C12H7Br2N)

3,6-Dibromo-9H-carbazole(cas: 6825-20-3) is used as a pharmaceutical intermediate, and also an important intermediate of synthesizing optoelectronic materials. It has been used as a reagent in the synthesis of P7C3-A20 which is a potent neuroprotective agent.Formula: C12H7Br2N

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Electric Literature of C20H20BrPIn 2022 ,《Enantio- and Regioselective Ni-Catalyzed para-C-H Alkylation of Pyridines with Styrenes via Intermolecular Hydroarylation》 appeared in Journal of the American Chemical Society. The author of the article were Ma, Jun-Bao; Zhao, Xia; Zhang, Dongju; Shi, Shi-Liang. The article conveys some information:

Herein the first enantioselective para-C-H activation of pyridines through the use of a Ni-Al bimetallic catalyst system and N-heterocyclic carbene (NHC) ligand for intermol. hydroarylation of styrenes was described. The reaction proceeded in high to excellent enantioselectivities (up to 98.5:1.5 er) and high site-selectivities for both styrene and pyridine components (up to >98:2). Consequently, a broad range of enantioenriched 1,1-diarylalkanes containing pyridine moieties could be prepared in a single step with 100% atom economy. Computational studies supported a mechanism involving a ligand-to-ligand H-transfer (LLHT) and reductive elimination sequence, with LLHT being the rate- and enantioselectivity-determining step. DFT studies indicated that the π-π stacking interaction between the NHC aryl fragment and trans-styrenes was critical for high reactivity and enantiocontrol.Ethyltriphenylphosphonium bromide(cas: 1530-32-1Electric Literature of C20H20BrP) was used in this study.

Ethyltriphenylphosphonium bromide(cas: 1530-32-1) is a phase transfer catalyst, used to accelerate the cure of phenolic-based epoxy resins, certain fluoroelastomer resins and thermosetting powder coatings. CatOnium ETPB is also used as catalysts in the synthesis of certain organic compounds.Electric Literature of C20H20BrP

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Safety of 3,6-Dibromo-9H-carbazoleIn 2019 ,《Method development for analyzing ultratrace polyhalogenated carbazoles in soil and sediment》 appeared in Ecotoxicology and Environmental Safety. The author of the article were Zhou, Yanxiao; Zhu, Guohua; Li, Mufei; Liu, Jinsong; Li, Zuguang; Sun, Junjun; Gong, Hongping; Wang, Ling; Wu, Chenwang; Zhou, Xin; Yin, Ge. The article conveys some information:

In the past few years, polyhalogenated carbazoles (PHCZs) have been of increasing concern because their structure is similar to that of legacy POPs. In the present study, an anal. method, including intensive cleanup and fractionation procedures in combination with instrumental parameters, was developed to determine ultratrace polyhalogenated carbazoles (PHCZs) in soil and sediment. The eluting sorbents, volume and packing of the column were optimized. Our results showed that 5 g of florisil and 4 g of silica gel under 150 mL of hexane/DCM = 3:1 presented good performance in terms of recovery and repeatability. GC-HRMS, GC-MS/MS (EI-MRM) and GC-MS (EI-SIM) were applied to compare the performance of PHCZ anal. For sensitivity, EI-MRM presents method detection limits comparable to those of GC-HRMS and much lower than those of EI-SIM. Regarding selectivity, GC-HRMS performed better than the other two techniques since GC-HRMS can reduce interference from perfluorokerosene (PFK) and DDX (DDT, DDE, and DDD) due to its high resolution GC-HRMS was then further optimized by shortening the run time and modifying the SIM ion. The final method was successfully applied to determine PHCZs in soil and sediment, and the target compounds had almost 100% detection frequency in the samples. The ubiquitous presence of PHCZ in soil and sediment calls for a further investigation of its source, distribution and degradation in the environment. In the part of experimental materials, we found many familiar compounds, such as 3,6-Dibromo-9H-carbazole(cas: 6825-20-3Safety of 3,6-Dibromo-9H-carbazole)

3,6-Dibromo-9H-carbazole(cas: 6825-20-3) is used as a pharmaceutical intermediate, and also an important intermediate of synthesizing optoelectronic materials. It has been used in the preparation of N-(2-hydroxyethyl)-3,6-dibromocarbazole.Safety of 3,6-Dibromo-9H-carbazole

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Liu, Naifang; Chen, Zhihui; Fan, Wenxuan; Su, Jie; Lin, Tingting; Xiao, Si; Meng, Jianqiao; He, Jun; Vittal, Jagadese J.; Jiang, Jianzhuang published an article in 2022. The article was titled 《Highly Efficient Multiphoton Absorption of Zinc-AIEgen Metal-Organic Frameworks》, and you may find the article in Angewandte Chemie, International Edition.Product Details of 523-27-3 The information in the text is summarized as follows:

A series of luminescent frameworks was synthesized from the selective combination of aggregation induced emission (AIE)-linker tetra-(4-carboxylphenyl)ethylene (H4TCPE) and Zn2+. Complex 1 was formed by the close packing of Zn-TCPE hinge, and isostructural complexes 2-5 were constructed by the linkage of Zn-TCPE layer and pillar ligands. These complexes exhibit highly efficient multiphoton excited photoluminescence (MEPL) and concomitant third-harmonic generation (THG). The multiphoton absorption (MPA) parameters of 1 are superior to other multiphoton emission materials including the perovskite nanocrystals. The incorporation of pillar linkers slows down the charge transfer between layers of Zn-TCPE, and the aromatic core of pillar linkers has a great influence on the MPA performance of the corresponding frameworks. The experimental part of the paper was very detailed, including the reaction process of 9,10-Dibromoanthracene(cas: 523-27-3Product Details of 523-27-3)

9,10-Dibromoanthracene(cas: 523-27-3) can be sublimated and oxidized to generate anthraquinone. Soluble in hot benzene and hot toluene, slightly soluble in alcohol, ether and cold benzene, insoluble in water.Product Details of 523-27-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2018,Advanced Materials (Weinheim, Germany) included an article by Song, Jizhong; Fang, Tao; Li, Jianhai; Xu, Leimeng; Zhang, Fengjuan; Han, Boning; Shan, Qingsong; Zeng, Haibo. Recommanded Product: Indium(III) bromide. The article was titled 《Organic-Inorganic Hybrid Passivation Enables Perovskite QLEDs with an EQE of 16.48%》. The information in the text is summarized as follows:

Perovskite quantum dots (QDs) with high photoluminescence quantum yields (PLQYs) and narrow emission peak hold promise for next-generation flexible and high-definition displays. However, perovskite QD films often suffer from low PLQYs due to the dynamic characteristics between the QD’s surface and organic ligands and inefficient elec. transportation resulting from long hydrocarbon organic ligands as highly insulating barrier, which impair the ensuing device performance. Here, a general organic-inorganic hybrid ligand (OIHL) strategy is reported on to passivate perovskite QDs for highly efficient electroluminescent devices. Films based on QDs through OIHLs exhibit enhanced radiative recombination and effective elec. transportation properties compared to the primal QDs. After the OIHL passivation, QD-based light-emitting diodes (QLEDs) exhibit a maximum peak external quantum efficiency (EQE) of 16.48%, which is the most efficient electroluminescent device in the field of perovskite-based LEDs up to date. The proposed OIHL passivation strategy positions perovskite QDs as an extremely promising prospect in future applications of high-definition displays, high-quality lightings, as well as solar cells. The experimental process involved the reaction of Indium(III) bromide(cas: 13465-09-3Recommanded Product: Indium(III) bromide)

Indium(III) bromide(cas: 13465-09-3) is used in organic synthesis as a water tolerant Lewis acid. It efficiently catalyzes the three-component coupling of β-keto esters, aldehydes and urea (or thiourea) to afford the corresponding dihydropyrimidinones.Recommanded Product: Indium(III) bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2018,Dubbu, Sateesh; Bardhan, Anirban; Chennaiah, Ande; Vankar, Yashwant D. published 《A Cascade of Prins Reaction and Pinacol-Type Rearrangement: Access to 2,3-Dideoxy-3C-Formyl β-C-Aryl/Alkyl Furanosides and 2-Deoxy-2C-Branched β-C-Aryl Furanoside》.European Journal of Organic Chemistry published the findings.Application of 13465-09-3 The information in the text is summarized as follows:

2,3-Dideoxy-3C-formyl β-C-aryl/alkyl furanosides were synthesized in a stereoselective manner through a cascade of Prins reaction and pinacol-type rearrangement of an -O-TBDPS protected homoallylic alc., derived from D-mannitol, and various carbonyl compounds Furthermore, this method was successfully applied to the synthesis of a fused-bicyclic β-C-aryl furanoside moiety and a 2,3-dideoxy-3C-Me β-C-aryl furanoside which are found in core structures of bioactive mols. Further, the strategy was extended to a silyl-Prins reaction for the synthesis of a 2-deoxy-2C-branched β-C-aryl furanoside. The experimental part of the paper was very detailed, including the reaction process of Indium(III) bromide(cas: 13465-09-3Application of 13465-09-3)

Indium(III) bromide(cas: 13465-09-3) is used as a catalyst to produce dithioacetals when unactivated alkynes react with thiols and fields such as optics and microelectronics that utilize semiconductor technology have wide uses for indium in high-performing solar cells.Application of 13465-09-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Realizing Tunable White Light Emission in Lead-Free Indium(III) Bromine Hybrid Single Crystals through Antimony(III) Cation Doping》 was written by Li, Zhongyuan; Song, Gaomin; Li, Ye; Wang, Le; Zhou, Tianliang; Lin, Zheshuai; Xie, Rong-Jun. Safety of Indium(III) bromideThis research focused ontunable white light emission leadfree indium bromine hybrid crystal; antimony cation doping. The article conveys some information:

Low-dimensional metal halide hybrids (OIMHs) have recently been explored as single-component white-light emitters for use in solid-state lighting. However, it still remains challenging to realize tunable white-light emission in lead-free zero-dimensional (0D) hybrid system. Here, a combination strategy has been proposed through doping Sb3+ enabling and balancing multiple emission centers toward the multiband warm white light. We first synthesized a new lead-free 0D (C8NH12)6InBr9·H2O single crystal, in which isolated [InBr6]3- octahedral units are separated by large organic cations [C8NH12]+. (C8NH12)6InBr9·H2O exhibits dual-band emissions with one intense cyan emission and a weak red emission tail. The low-energy ultrabroadband red emission tail can be greatly enhanced by the Sb3+ doping. Exptl. data and first-principles calculations reveal that the original dominant cyan emission is originated from the organic cations [C8NH12]+ and that the broadband red emission is ascribed to self-trapped excitons in [In(Sb)Br6]3-. When the Sb concentration is 0.1%, a single-component warm white-light emission with a photoluminescence quantum efficiency of 23.36%, correlated color temperature of 3347 K, and a color rendering index up to 84 can be achieved. This work represents a significant step toward the realization of single-component white-light emissions in environmental-friendly, high-performance 0D metal halide light-emitting materials. After reading the article, we found that the author used Indium(III) bromide(cas: 13465-09-3Safety of Indium(III) bromide)

Indium(III) bromide(cas: 13465-09-3) is used in organic synthesis as a water tolerant Lewis acid. It efficiently catalyzes the three-component coupling of β-keto esters, aldehydes and urea (or thiourea) to afford the corresponding dihydropyrimidinones.Safety of Indium(III) bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《A Concise Total Synthesis of (+)-Waihoensene Guided by Quaternary Center Analysis》 was written by Peng, Cheng; Arya, Piyush; Zhou, Zhiyao; Snyder, Scott A.. Application of 1779-49-3This research focused onwaihoensene total synthesis Conia ene cyclization Pauson Khand; Conia-ene; Pauson-Khand; total synthesis; triquinanes; waihoensene. The article conveys some information:

The four contiguous all-carbon quaternary centers of waihoensene (I), coupled with the absence of any traditional reactive functional groups other than a single alkene, render it a particularly challenging synthetic target among angular triquinane natural products. Here, we show that its polycyclic frame can be assembled concisely by using a strategically chosen quaternary center to guide the formation of the other three through judiciously selected C-C bond formation reactions. Those events, which included a unique Conia-ene cyclization and a challenging Pauson-Khand reaction, afforded a 17-step synthesis of the mol. in enantioenriched form. In the experimental materials used by the author, we found Methyltriphenylphosphonium bromide(cas: 1779-49-3Application of 1779-49-3)

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is a lipophilic molecule with a cation allowing for it to be used to deliver molecules to specific cell components. Also considered an antineoplastic agent.Application of 1779-49-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yang, Hui-Yi; Yao, Ya-Hong; Chen, Ming; Ren, Zhi-Hui; Guan, Zheng-Hui published their research in Journal of the American Chemical Society in 2021. The article was titled 《Palladium-Catalyzed Markovnikov Hydroaminocarbonylation of 1,1-Disubstituted and 1,1,2-Trisubstituted Alkenes for Formation of Amides with Quaternary Carbon》.Application In Synthesis of Ethyltriphenylphosphonium bromide The article contains the following contents:

Hydroaminocarbonylation of alkenes is one of the most promising yet challenging methods for the synthesis of amides. Herein, we reported the development of a novel and effective Pd-catalyzed Markovnikov hydroaminocarbonylation of 1,1-disubstituted or 1,1,2-trisubstituted alkenes with aniline hydrochloride salts to afford amides bearing an α quaternary carbon. The reaction makes use of readily available starting materials, tolerates a wide range of functional groups, and provides a facile and straightforward approach to a diverse array of amides bearing an α quaternary carbon. Mechanistic investigations suggested that the reaction proceeded through a palladium hydride pathway. The hydropalladation and CO insertion are reversible, and the aminolysis is probably the rate-limiting step. In the experimental materials used by the author, we found Ethyltriphenylphosphonium bromide(cas: 1530-32-1Application In Synthesis of Ethyltriphenylphosphonium bromide)

Ethyltriphenylphosphonium bromide(cas: 1530-32-1) is a phase transfer catalyst, used to accelerate the cure of phenolic-based epoxy resins, certain fluoroelastomer resins and thermosetting powder coatings. It is also used as catalysts in the synthesis of certain organic compounds and as a pharmaceutical intermediate.Application In Synthesis of Ethyltriphenylphosphonium bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Catalyzing the Hydrodefluorination of CF3-Substituted Alkenes by PhSiH3. H• Transfer from a Nickel Hydride》 was written by Yao, Chengbo; Wang, Shuai; Norton, Jack; Hammond, Matthew. Recommanded Product: 1779-49-3 And the article was included in Journal of the American Chemical Society in 2020. The article conveys some information:

The hydrodefluorination of CF3-substituted alkenes can be catalyzed by a nickel(II) hydride bearing a pincer ligand. The catalyst loading can be as low as 1 mol%. Gem-Difluoroalkenes containing a number of functional groups can be formed in good to excellent yields by a radical mechanism initiated by H• transfer from the nickel hydride. The relative reactivity of various substrates supports the proposed mechanism, as does a TEMPO trapping experiment In the experiment, the researchers used many compounds, for example, Methyltriphenylphosphonium bromide(cas: 1779-49-3Recommanded Product: 1779-49-3)

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.Recommanded Product: 1779-49-3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary